package com.wang.controller;

import com.google.gson.Gson;
import com.wang.commonutils.JwtUtils;
import com.wang.commonutils.R;
import com.wang.entity.UcenterMember;
import com.wang.service.UcenterMemberService;
import com.wang.servicebase.exceptionhandler.GuliException;
import com.wang.utils.ConstantWxUtils;
import com.wang.utils.HttpClientUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;


import java.net.URLEncoder;
import java.util.HashMap;


@Controller
@RequestMapping("/api/ucenter/wx")
@CrossOrigin
public class WxApiController {

    @Autowired
    private UcenterMemberService memberService;

    /**
     * 获取扫描人的信息，添加数据
     * @return
     */
    @GetMapping("callback")
    public String callback(String code, String state){
        try{
//            1. 获取code值，临时票据，类似于验证码
//            2. 拿着code请求 微信固定的地址 得到2个值 access_token 和 openid
            String baseAccessTokenUrl = "https://api.weixin.qq.com/sns/oauth2/access_token"+
                    "?appid=%s" +
                    "&secret=%s" +
                    "&code=%s" +
                    "&grant_type=authorization_code";
            //拼接三个参数 ：id 密钥 和code值
            String accessTokenUrl = String.format(
                    baseAccessTokenUrl,
                    ConstantWxUtils.WX_OPEN_APP_ID,
                    ConstantWxUtils.WX_OPEN_APP_SECRET,
                    code
            );
//            请求这个拼接好的地址，得到返回的两个值 access_token 和 openid
//            使用httpclient发送请求，得到返回结果
            String accessTokenInfo = HttpClientUtils.get(accessTokenUrl);

            //从accessTokenInfo字符串获取出来两个值 access_token 和 openid
            //把accessTokenInfo字符串转换map集合，根据map里面key获取对应值
            Gson gson = new Gson();
            HashMap mapAccessToken = gson.fromJson(accessTokenInfo,HashMap.class);
            String access_token = (String) mapAccessToken.get("access_token");
            String openid = (String) mapAccessToken.get("openid");

            //把扫描人信息添加数据库里面
            //判断数据表里面是否存在相同微信信息，根据openid判断
            UcenterMember member = memberService.getOneIdMember(openid);
            if (member == null ){ //member是空，表没有相同微信数据，进行添加

                //拿着得到accsess_token 和 openid，再去请求微信提供固定的地址，获取到扫描人信息
                //访问微信的资源服务器，获取用户信息
                String baseUserInfoUrl = "https://api.weixin.qq.com/sns/userinfo" +
                        "?access_token=%s" +
                        "&openid=%s";
                //拼接两个参数
                String userInfoUrl = String.format(
                        baseUserInfoUrl,
                        access_token,
                        openid
                );
                //发送请求
                String userInfo = HttpClientUtils.get(userInfoUrl);
                HashMap userInfoMap = gson.fromJson(userInfo, HashMap.class);
                String nickname = (String) userInfoMap.get("nickname");//昵称
                String headimgurl = (String) userInfoMap.get("headimgurl");//头像

                member = new UcenterMember();
                member.setOpenid(openid);
                member.setNickname(nickname);
                member.setAvatar(headimgurl);
                memberService.save(member);

            }

            //使用jwt根据member对象生成token字符串
            String jwtToken = JwtUtils.getJwtToken(member.getId(),member.getNickname());
            //最后：返回首页面，通过路径传递token字符串
            return "redirect:http://localhost:3000?token="+jwtToken;

        }catch (Exception e){
            throw new GuliException(20001,"登录失败!");
        }


    }

    /**
     * 生成微信扫描二维码
     * @return
     */
    @GetMapping("/login")
    public String getWxCode(){
        //固定地址，后面拼接参数
//        String url = "https://open.weixin.qq.com/connect/qrconnect?appid="+ ConstantWxUtils.WX_OPEN_APP_ID+"&response_type=code";
        //微信开放平台授权baseUrl %s相当于？代表占位符
        String baseUrl = "https://open.weixin.qq.com/connect/qrconnect" +
                "?appid=%s" +
                "&redirect_uri=%s" +
                "&response_type=code" +
                "&scope=snsapi_login" +
                "&state=%s" +
                "#wechat_redirect";

        //对redirect_url进行URLEncoding编码
        String redirectUrl = ConstantWxUtils.WX_OPEN_REDIRECT_URL;

        try {
            redirectUrl = URLEncoder.encode(redirectUrl, "utf-8");
        } catch (Exception e) {
        }


        String url = String.format(
                baseUrl,
                ConstantWxUtils.WX_OPEN_APP_ID,
                redirectUrl,
                "atguigu"
        );

        //重定向到请求微信地址
        return "redirect:"+url;
    }
}
